1[1]Linn FH, Wijdicks EF, Van der Graf Y, et al. Prospective study of sentinel headache in aneurysmal subarachnoid haemorrhage. Lancet 1994;344(8922) :590
2[2]Linn FH, Rinkel G J, Algra A, et al. Headache characteristics in subarachnoid haemorrhage and benign thunde rclap headache. JNeurol Neurosurg Psychiatry 1998;65(5) :791
3[3]Van der Wee N, Rinkel GJ, Hasan D, et al. Detection of sub arachmoid haemorrlage on early CT: is lumbar puncture still needed after a negative scan? J Neurol Neurosurg Psychiatry 1995 ;58(3): 357
4[4]Vermeulen M, Van Gijn J. The diagnosis of subarachnoid haem orrhage. J Neurol Neurosurg Psychiatry 1990;53(5) :365
